Question

bsc 1005 exam 3, fall 2025
started: dec 4 at 8:32am
quiz instructions
question 56
a key characteristic of echinoderms is ______.
○ their foot and mantle structures
○ their segmented body
○ their fused appendages
○ their endoskeleton

Explanation:

Echinoderms have an endoskeleton made of calcium carbonate plates. Foot and mantle are in mollusks. Segmented body is in annelids. Fused appendages are not a key echinoderm feature.

Answer:

their endoskeleton